Set a Per-Recipient JWE Header

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetRecipientHeader, which sets the per-recipient unprotected header for a recipient index.

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    CkJwe jwe = new CkJwe();

    //  Protected header: AES key-wrap with AES-256-GCM content encryption.
    CkJsonObject header = new CkJsonObject();
    header.UpdateString("alg","A256KW");
    header.UpdateString("enc","A256GCM");
    success = jwe.SetProtectedHeader(header);
    if (success == false) {
        System.out.println(jwe.lastErrorText());
        return;
        }

    //  The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key from a
    //  secure source rather than hard-coding it.
    String base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
    success = jwe.SetWrappingKey(0,base64Key,"base64");
    if (success == false) {
        System.out.println(jwe.lastErrorText());
        return;
        }

    //  Set the per-recipient unprotected header for recipient 0, for example a key id used to identify
    //  which key a recipient should use.
    CkJsonObject recipHeader = new CkJsonObject();
    recipHeader.UpdateString("kid","recipient-key-1");
    success = jwe.SetRecipientHeader(0,recipHeader);
    if (success == false) {
        System.out.println(jwe.lastErrorText());
        return;
        }

    CkStringBuilder sbContent = new CkStringBuilder();
    sbContent.Append("This is the secret content.");
    CkStringBuilder sbJwe = new CkStringBuilder();
    success = jwe.EncryptSb(sbContent,"utf-8",sbJwe);
    if (success == false) {
        System.out.println(jwe.lastErrorText());
        return;
        }

    System.out.println(sbJwe.getAsString());
  }
}